Atoms and the Periodic table

Page
10

Learning Check

Select the element in each pair with the larger atomic

radius.

A. Li or K

B. K or Br

C. P or Cl

Slide 94

Solution

Select the element in each pair with the larger atomic

radius.

A. K

B. K

C. P

Slide 95

Key Words

Chemistry

Matter

Pure substance

Mixture

Element

Compound

Homogeneous mixture

Heterogeneous mixture

States of matter

Solid

Liquid

Gas

Physical changes

Chemical changes

Atom

Molecule

Periodic table

Periods

Groups or Families

Main group elements

Slide 96

Key Words (cont)

Transition elements

Metals

Nonmetals

Semimetals

Protons

Neutrons

Electrons

Atomic number

Mass number

Isotopes

Atomic Mass

Nucleus

Electromagnetic radiation

Wavelength

Energy level

Ground state

Excited state

Orbital

Electronic configuration

Valence electrons

Outer shell